Update the CHANGELOG.md and CODE_OF_CONDUCT.md

[lshariprasad]

Hey contributor! 👋 Thanks for the PR!

Before we jump into review, please make sure these are checked:

• I opened an issue first so the change is aligned with the maintainers
  (Bug/Issue link: https://github.com/googleapis/google-api-python-client/issues/new/choose)
• Tests + linter are passing
• Coverage hasn’t dropped (if code changes were made)
• Docs were updated (if applicable)

Issue Reference

Fixes #<issue_number_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @lshariprasad, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the project's Code of Conduct to a newer, more robust version. The aim is to provide clearer expectations for community behavior and a more transparent process for addressing violations, thereby fostering a more welcoming and inclusive environment for all contributors.

Highlights

• Code of Conduct Update: The project's CODE_OF_CONDUCT.md file has been entirely replaced, upgrading from Contributor Covenant version 1.2.0 to the more comprehensive version 2.1.
• Enhanced Guidelines and Enforcement: The new Code of Conduct introduces detailed sections on community pledges, specific standards for acceptable and unacceptable behavior, clear enforcement responsibilities, reporting procedures, and a structured four-tier enforcement guideline (Correction, Warning, Temporary Ban, Permanent Ban).

Changelog

• CODE_OF_CONDUCT.md
  • Updated the Code of Conduct from Contributor Covenant version 1.2.0 to version 2.1.
  • Introduced new sections including 'Our Pledge', 'Our Standards' (with examples of positive and unacceptable behaviors), 'Enforcement Responsibilities', 'Scope', 'Enforcement' procedures, and detailed 'Enforcement Guidelines' with a four-tier consequence system.

Activity

• The pull request description includes a standard contributor checklist for pre-review verification.

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[gemini-code-assist]

Code Review

This pull request updates the CODE_OF_CONDUCT.md to a more recent and comprehensive version (Contributor Covenant v2.1), which is a great improvement. The new text is well-structured, though I found one small area with redundant text that could be removed for clarity. Note that while the PR title mentions CHANGELOG.md, no changes for that file were included in this review.